摘要
用氯化铕和2,4-吡啶二甲酸在水热条件下反应合成了一个二维铕稀土配位聚合物{[Eu(pdc)(ox)0.5(H2O)4]·2H2O}n(1)(H2pdc=2,4-吡啶二甲酸;ox=草酸根阴离子),草酸根离子由部分2,4-吡啶二甲酸分解产生。X-射线单晶衍射分析表明,该配位聚合物属单斜晶系,P121/c1(No.14)空间群,晶胞参数为a=1.53047(15)nm,b=1.10973(9)nm,c=0.85494(15)nm,β=102.81(1)°,α=γ=90°。Eu3+为九配位,除了与一个pdc阴离子配体和一个ox阴离子配体螯合配位外,还与四个水分子配位。pdc阴离子通过2-位羧基以μ2-桥联方式连接两个Eu3+,吡啶环上的氮原子与其中一个Eu3+配位,4-位羧基没有参与配位。草酸根阴离子以螯合方式连接两个Eu3+。配体pdc和ox与Eu3+通过配位键连接形成了少见的2D之字形平面,该配合物在紫外光的激发下显示鲜艳的红色荧光,表明该配位聚合物具有良好的荧光性质,热重分析表明该配位聚合物具有较好的热稳定性。
A 2D rare earth europium coordination polymer { [Eu（pdc）（ox）0. 5（H2O）4]·2H2O}n（1）（H2pdc= 2,4-pyridinedicarboxylic acid; ox = oxalate anion） had been synthesized using europium chloride reacting with 2,4-pyridinedicarboxylic acid by hydrothermal method. Oxalate anions is from the decomposing of part of2,4-pyridinedicarboxylic acid. X-ray diffraction analysis of single crystal shows that the coordination polymer is crystallized in monoclinic system,P121 /c1（No. 14） space group. The cell parameters are as follows： a =1. 53047（15） nm,b = 1. 10973（9） nm,c = 0. 85494（15） nm,β = 102. 81（1） °,α = γ = 90°. Eu3 ＋is ninecoordinated and each Eu3 ＋coordinates with a pdc anion,an ox anion and four water molecules. The pdc anion connects two Eu3 ＋ions by μ2-bridge way with the 2-carboxyl group. The nitrogen atom on pyridyl also coordinates to one Eu3 ＋,but the 4-carboxyl group does not coordinate with Eu3 ＋ion. Each ox anion connects two Eu3 ＋by chelating way. A rare 2D zigzag layer is formed by the connections of Eu3 ＋with pdc and ox aions.The complex exhibits intense characteristic luminescence of Eu3 ＋with excitation of UV-rays. TG analysisshows the complex has good thermal stability.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2015年第1期280-286,共7页
Journal of Synthetic Crystals
基金
河南省科技厅重点科技(132102210263)
国家自然科学基金(21101113)
关键词
2
4-吡啶二甲酸
铕
配位聚合物
荧光性质
2
4-pyridinedicarboxylic acid
europium
coordination polymer
fluorescent property
